Over all experience of Warhead was much better. Shorter, yes. More linear..... debatable, it really wasn't cut back too much when you go back and look at the levels side-by side again. Some were definitely more linear though.... and that's also what caused the performance increase from C1 (more occluders).
Crysis 2 really wasn't THAT linear, when you consider how hard it is to make something open in a city. You also forget how much of C1 is linear: The entire first level, until sunrise... and then it only branches out because 90% of it is water. It soon thereafter becomes linear again. The second level is extremely linear. The alien ship, and the level after that are linear. The battle ship is linear. The flying level is linear. I don't really remember much other than that though. Maybe I'll go re-install the editor to show you. :P
FC2 made by Crytek would have probably been like FC1... a semi-linear sci-fi fps. :P
Edit: It's all about the illusion of freedom, and Crysis is great at it. I'll edit back later and try and add some C2 examples, but C2 has a lot more vertical play, so it'll be harder to show.
Red is "linear", Blue is "open"
Island (first level):
I don't count the ocean because it's procedural generation, and there isn't jack to do there.
Village (second level):
50% of that blue is also procedural, but meh.
And of course, the performance killing "Ice":
<message edited by zurginator on Thursday, April 26, 2012 7:27 AM>